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Title: Composition-tunable ZnxCd1-xSe nanocrystals with high luminescence and stability
Authors: Zhong, X. 
Han, M. 
Dong, Z.
White, T.J.
Knoll, W. 
Issue Date: 16-Jul-2003
Citation: Zhong, X., Han, M., Dong, Z., White, T.J., Knoll, W. (2003-07-16). Composition-tunable ZnxCd1-xSe nanocrystals with high luminescence and stability. Journal of the American Chemical Society 125 (28) : 8589-8594. ScholarBank@NUS Repository.
Abstract: High-quality ZnxCd1-xSe nanocrystals have been successfully prepared at high temperature by incorporating stoichiometric amounts of Zn and Se into pre-prepared CdSe nanocrystals. With increasing Zn content, a composition-tunable emission across most of the visible spectrum has been demonstrated by a systematic blue-shift in emission wavelength. The photoluminescence (PL) properties for the obtained ZnxCd1-xSe nanocrystals (PL efficiency of 70 - 85%, fwhm = 22 - 30 nm) are comparable to those for the best reported CdSe-based QDs. In particular, they also have good PL properties in the blue spectral range. Moreover, the alloy nanocrystals can retain their high luminescence (PL efficiency of over 40%) when dispersed in aqueous solutions and maintain a symmetric peak shape and spectral position under rigorous experimental conditions. A rapid alloying process was observed at a temperature higher than "alloying point". The mechanism of the high luminescence efficiency and stability of ZnxCd1-xSe nanocrystals is explored.
Source Title: Journal of the American Chemical Society
ISSN: 00027863
DOI: 10.1021/ja035096m
Appears in Collections:Staff Publications

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